BR112021016709A2 - UNLOAD SYSTEM AND ENGINE VEHICLE OF THE SAME - Google Patents

Abstract

unloading system and motor vehicle thereof. The present matter relates to an unloading system for a motor vehicle. a discharge pipe (205) of the discharge system formed by a first portion (206) and a second portion (207). the first portion (206) includes a first upstream end portion (208) connected to an exhaust port (184). the second portion (207) is disposed downstream of the first portion (206), and the second portion (207) includes a second upstream end portion (215). one of the first portion (206) and the second portion (207) is adapted to support at least one portion of a treatment device (211). the first portion (206) is capable of annularly surrounding, at least partially, the treatment device (211). the discharge pipe (205) is ideally provided with minimal parts and joints, and at the same time offers rapid heating of the treatment device (211).

Description

“UNLOADING SYSTEM AND ENGINE VEHICLE OF THE SAME” FIELD OF TECHNIQUE

[0001] The present subject, in general, relates to a motor vehicle that includes an internal combustion engine and, in particular, it relates to a combustion gas discharge system for the internal combustion engine of the motor vehicle .

BACKGROUND

[0002] Generally, motor vehicles, similar to ride-on type vehicles that are compact, are equipped with an internal combustion engine (IC) unit. These ride-on type vehicles have gained popularity due to their compact design and ability to carry an additional passenger and/or load loads on it. These vehicles can be two-wheeled or three-wheeled, depending on the application, engine model, etc. Some of these vehicles are equipped with an oscillating type motor, and a connecting link similar to a toggle link is provided to oscillately support the IC motor unit. Other types of mount type vehicles have the engine IC fixedly mounted to the frame. In these vehicles the IC engine can be tilted forward. Thus, these vehicles have an exhaust system that extends into a lower portion of the vehicle and that extends towards a muffler positioned on one side of the vehicle or may be in a center. Thus, the vehicle must be provided with sufficient ground clearance to safely accommodate the unloading system, which is one of many packaging and modeling challenges in such vehicles.

[0003] Additionally, these mount-type motor vehicles are operated on different terrains and with different driving patterns such as those that are dependent on the operating location or user, which are beyond the control of the manufacturer. These vehicles when operating on such different terrains and with different driving patterns, are subject to jerks and the resulting impact can be transferred to various vehicle systems.

[0004] Furthermore, when the oscillating type IC motor is provided, it is directly subjected to such thrusts due to the connection with at least one wheel of the vehicle, which is subject to oscillating motion. The discharge system directly connected to the IC motor directly receives such impacts from the IC motor. Thus, the discharge system requires rigid mounting.

[0005] Additionally, inherently the motor vehicle can have vibrations due to the presence of the IC engine which is operated over a wide range of engine revolutions per minute (RPM) causing vibrations that propagate to other parts of the vehicle. The various systems mounted on the vehicle, especially the exhaust system, must be securely accommodated in the motor vehicle and must be able to perform optimally without failure, even when the vehicle is subjected to such jerks or vibrations.

[0006] Furthermore, the exhaust system has to perform ideally in order to treat exhaust gases without any system failure, even under severe usage conditions. For example, low ground clearance can damage the exhaust system, which is substantially lower in the vehicle, which results in affecting the performance of the exhaust system.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The detailed description is described with reference to the attached figures. Equal numbers are used throughout the drawings to refer to similar features and components.

[0008] Figure 1 represents a right side view of an exemplary motor vehicle, according to an embodiment of the present matter.

[0009] Figure 2 illustrates a front perspective view of the power unit, according to the modality as represented in Figure 1.

[0010] Figure 3 represents a perspective view of the right side of a discharge system, according to the embodiment of Figure 2.

[0011] Figure 4 represents an exploded view of a portion of the discharge system, according to the modality as represented in Figure 3.

[0012] Figure 5 represents a detailed view of the discharge pipe, according to an embodiment of the present matter.

[0013] Figure 6 represents another detailed view of a portion of the discharge pipe, according to an embodiment of the present matter.

[0014] Figure 7 (a) represents a sectional view of the discharge pipe, taken on the geometric axis A-A', according to another embodiment of the present matter.

[0015] Figure 7 (b) represents another sectional view of the discharge pipe, taken on the geometric axis B-B', according to another embodiment of the present matter as represented in Figure 7 (a).

[0016] Figure 7 (c) represents another sectional view of the discharge pipe, taken on the geometric axis C-C', according to another embodiment of the present matter as represented in Figure 7 (a).

[0017] Figure 8 represents the graphical representation of treatment device conversion efficiency versus time.

[0018] Figure 9 represents a sectional view of a discharge system, taken along the geometric axis X-X', according to an embodiment of the present matter.

[0019] Figure 10 (a) represents a sectional view of an implementation of the discharge system, taken along the geometric axis Y-Y', according to an embodiment of the present matter.

[0020] Figure 10 (b) represents another sectional view of another implementation of the discharge system, according to an embodiment of the present matter.

[0021] Figure 11 represents a sectional view of the discharge, according to yet another embodiment of the present matter.

[0022] Figure 12 represents an exploded view of the discharge, according to the embodiment of Figure

11.

[0023] Figure 13 represents a graphical representation of uniformity index against various flow rates.

DETAILED DESCRIPTION

[0024] Conventionally, motor vehicles are equipped with control means that include the internal combustion engine (IC) and/or a traction engine. In addition, the vehicle includes several subsystems such as the air induction system, which works in combination with the fuel supply system, such as the carburetor or fuel injector. The air-fuel mixture is fed to the IC engine for combustion, which produces the desired power and torque that is transferred to at least one wheel of the vehicle. In addition, the gas discharge system includes an exhaust pipe that transmits the gases generated during the combustion process to a silencer. Generally, the gases that are produced can include several harmful components that include total hydrocarbons (THC), carbon monoxide (CO), and nitrogen oxides (NOx). There is a need to treat the harmful components before emitting the gases to the atmosphere through the silencer. Typically, a gas treatment device is used to treat the above mentioned harmful components before they are emitted to the atmosphere. Thus, the known exhaust pipe/drain pipe has to accommodate the treatment device securely.

[0025] Generally, the gas treatment device is arranged inside the discharge system. The treatment device has a shut-off, or operating temperature, which must be reached in the shortest possible time for the treatment device to function optimally with the best efficiency. To achieve early erasure, the treatment device can be arranged in close proximity to the exhaust port. However, the arrangement of the treatment device in close proximity to the exhaust port can damage the treatment device, thus leading to poor durability which is primarily due to the extremely high temperature exposure of the exhaust gases closest to the outlet portion. If the treatment device is disposed away from the exhaust port, the treatment device would not achieve early extinguishing, whereby the exhaust gases would not be treated. Figure 8 shows a graphical representation of conversion efficiency of a treatment device versus time in conventional systems. Line A (dotted line) represents the conversion efficiency of the treatment device from the motor start-up time until reaching a peak or sweet spot. As shown, the conventional treatment device takes longer to reach its maximum efficiency for exhaust gas treatment. In other words, the treatment device takes longer to reach its erase temperature. Within that time, a large amount of exhaust gases is not treated, which is undesirable. Thus, the challenge is to provide an early erase flushing system without damaging it.

[0026] Conventionally, a heating coil may be provided to heat the treatment device as untreated gases are emitted during the first few minutes of engine start-up, which is before the treatment device becomes sufficiently operational. . Some solutions in the art suggest the provision of additional components, such as a heating coil, which helps to bring the treatment device to operating temperature quickly, immediately after starting the engine. However, such a system is not economical and, at the same time,

the system is not efficient as it consumes battery power for heating. The provision of a heating coil or such electrical/electronic heating system may act as a deterrent to the operation of other vehicle electronic systems due to the high power requirements for heating coils, which cannot be delivered by the alternator during engine start-up. engine as the engine operates at low RPM. In this way, the motor charges due to power requirements or the battery is used. Additionally, it is difficult to package the additional heating system within the model with good ground clearance.

[0027] Also, the exhaust gases leaving the exhaust port are traveling at high speed and these gases funnel down towards the treatment device to only a certain region, which leaves the other region of the treatment device underutilized. . The presence of the curved portion of the exhaust pipe immediately after the upstream end, which is mostly available on most IC engine models, causes the high velocity exhaust gases to flow along one side, shall we say, the opposite side. the exhaust port, the exhaust pipe and the exhaust gases reach the treatment device using only a partial portion of the treatment device, which results in low utilization of the treatment device. Additionally, only a partial portion of the treatment device is overused, which leads to early failure of the treatment device, which is undesired. As the treatment device fails it may require replacement of the entire exhaust system, which is a costly affair. For example, referring to Figure 13, the L1 line represents the uniformity index at various motor flow rates in a conventional system. Line L1 shows that there is low utilization of the treatment device due to low surface uniformity/face uniformity of exhaust gas flow. This can also provide fluctuating oxygen content information due to poor uniformity.

[0028] For example, in a forward leaning engine, exhaust gases exiting the down-facing side of the exhaust port funnel downwards, flowing towards the treatment device. Even so, the exhaust gases are fixed in a certain portion of the exhaust pipe, which means that only some portion of the treatment is used. This is because the high velocity exhaust gas passes through only a certain region of the exhaust passage, while other portions of the exhaust gas travels at low velocity and also results in turbulence, affecting the flow. Additionally, exhaust gases flowing at high velocity will pass quickly through the treatment device, leaving minimal time for conversion/treatment to take place. This results in low conversion treatment of the exhaust gases.

[0029] In addition, an additional challenge is to accommodate a treatment device in an unloading system on vehicles that have a forward leaning engine. In such vehicles, the ground clearance of the vehicle with reference to the position of the exhaust port is substantially low to accommodate and direct the exhaust pipe in such compact ground clearance. In the art, some solutions have been proposed to solve the treatment device accommodation problem, for example the treatment device is arranged in a split portion of the discharge pipe by using two fasteners on both sides of the treatment device. Such systems involve multiple welding points, which are considered weak points in terms of leakage or even in terms of structural strength, as the discharge system is rigidly connected to the IC motor. In the above mentioned systems, the exhaust pipe must be split, two device retaining members must be provided on both sides of the treatment device, and the treatment device is arranged in a housing, which results in an increase in the number of components. , which implies an increase in the number of joints, which is challenging. The discharge pipe provided with the treatment device remains suspended and such aforementioned multiple parts increase the weight of the system which makes the joints vulnerable to failure due to the system's own weight, resonance forces, fatigue loads and due to external parameters such as thrust. or vibrations.

[0030] At this beginning, the additional challenge is to accommodate such above-mentioned discharge systems in a compact mount-type vehicle, maintaining sufficient ground clearance and ideally arranging the discharge system. In order to maintain ground clearance, the downpipe requires sharp bending, which is tricky in tubular parts. Furthermore, the treatment device cannot be accommodated close to the bend in such systems. In this way, treatment device blanking is low while delivering overall powertrain performance.

[0031] Furthermore, the IC engine is equipped with a lambda sensor or oxygen sensor, which is used to measure and monitor the amount of residual oxygen in the exhaust gases. The data provided by the lambda sensor is used by a control unit to change/regulate the air-fuel mixture being supplied to the IC engine. Therefore, the lambda sensor requires it to be mounted in the exhaust system.

[0032] Similar to the conversion device, the lambda sensor also needs to be placed at an optimal distance from the exhaust port. Generally, the lambda sensor being arranged in the exhaust pipe is known in the art, where the lambda sensor is arranged at a point where the information provided by the sensor is not absolute. However, such a design requires separate provision for the sensor in the exhaust pipe, which increases the size of the exhaust pipe. Furthermore, for the optimal functioning of the exhaust pipe, it must be placed in close proximity to the exhaust port, specifically it must be placed close to the curved portion of the exhaust pipe, which is a great challenge due to the complexity of mounting the sensor. on a curved surface. Additionally, supplying the lambda sensor in the exhaust pipe can lead to exhaust gas leakage through which the lambda sensor would not be able to provide accurate data related to the exhaust gases, say, the oxygen content. Thus, the control unit tends to change/regulate the air-fuel mixture depending on inaccurate data. This affects engine performance which results in rich mixture or simple mixture under unwanted engine operating conditions. Furthermore, an additional plate/housing can be provided to provide a tight seal of the exhaust from exhaust gases which increase the size of the exhaust system, especially that of the exhaust pipe, which is usually a tubular member, which affects the vehicle model. . For example, on a vehicle that has an engine leaning forward, the vehicle's ground clearance is affected.

[0033] In addition, the lambda sensor must be able to provide the oxygen content related data before treatment and in some cases an additional lambda sensor can be used to get the post conversion data. Thus, there is a design dilemma to accommodate the treatment device and the lambda sensor ideally in close proximity to the exhaust port.

[0034] Accordingly, there is a need to address the aforementioned and other deficiencies of the prior art. Consequently, the discharge system must be able to offer reduced weaknesses such as joints that provide structural rigidity to the system. In addition, the discharge system must be able to provide optimal performance.

[0035] Therefore, the present matter provides a discharge system for a motor vehicle. The motor vehicle comprises a power unit that includes an internal combustion engine (IC). An IC engine cylinder head includes an exhaust port provided on one of the side walls thereof. The exhaust system includes an exhaust pipe that has one end connected to the exhaust port and the other end connected to a muffler. In one embodiment, a primary treatment device is provided within the muffler and a primary treatment device is provided on the exhaust pipe in proximity to the exhaust port.

[0036] It is a feature of the present matter that the exhaust pipe includes a first portion, a second portion, wherein the second portion is disposed downstream of the first portion with respect to the direction of exhaust gas flow. The exhaust pipe is connected to the exhaust port through the first portion and the second portion remains connected to the muffler. Thus, the discharge pipe of the present matter is a compact unit with primarily two parts namely, a first portion and a second portion, which are minimal compared to similar conventional systems.

[0037] It is a feature of the present subject that a preliminary treatment device is encased/accommodated, at least partially, in the first portion, which is in proximity to the exhaust port offering early erasure thereof. It is an aspect that the first portion defines an accommodation space capable of accommodating the preliminary treatment device in proximity to the exhaust port and still providing sufficient ground clearance.

[0038] It is another feature of the present matter that the second portion supports the preliminary treatment device and the first portion surrounding the preliminary treatment device is connected to the second portion. The preliminary treatment device is not arranged in an intermediate way, which would normally require multiple solders or connections. In this way, the number of weak points is reduced as the number of joints (welds) is reduced.

[0039] It is yet another aspect of the present matter that the preliminary treatment device is cantilevered/cantilever mounted in one of a first portion and the second portion. In one embodiment, an upstream end portion of the second portion is adapted to cantilever the treatment device. The term 'cantilever mounted' used herein infers that one end (downstream end) of the preliminary treatment device is the upstream end portion of the second portion, and another end portion of the preliminary treatment device is suspended within the first portion without any direct contact with it.

[0040] In one embodiment, the second portion is formed by one or more tubular metal pipes. In another embodiment, the second portion may include concentrically disposed tubular metal pipes. Furthermore, the first portion is formed by one or more sub-members. The one or more sub-members are connected together, forming a space capable of accommodating at least a portion of the preliminary treatment device.

[0041] In one implementation, the first portion is formed by a first sub-member and a second sub-member that are partitioned along at least one plane that passes along the geometric axis. The first sub-member and the second sub-member are connected to each other, forming an annularly closed structure. Additionally, the first portion includes a flange member secured to an upstream end portion of the sub-members. The first portion remains attached to the exhaust port through the flange portion.

[0042] It is an aspect that in one embodiment, the second portion includes a clutch member that is attached to the upstream end portion of the second portion, wherein the clutch member is adapted to support the preliminary treatment device as it progresses. the clutch member can have a different cross-sectional profile that can match both the second portion and the treatment device. In another embodiment, the clutch member may be integrally formed with the second portion in forming the clutch member.

[0043] In one implementation, the preliminary treatment device is cantilevered/cantilever mounted to the clutch member and may be further supported by one or more support blocks provided on an inner periphery of the first portion to annularly support the treatment device .

[0044] In one implementation, the sub-members have a substantially C-shaped profile. The C-shaped profile, or curved outer profile, used in the present document may be formed by any symmetrical/asymmetrical geometric profile that has an opening towards One side. The two or more C-shaped sub-members that connect together form a volume therein to accommodate the treatment device, thus acting as the cover for the treatment device.

[0045] It is a feature of the present matter that the discharge pipe has one or more bends in which the direction of extension of the discharge pipe is changed and the first portion includes at least one bend and the second portion includes at least one bend. Furthermore, at least one bend of the first portion is formed by bending the sub-member(s).

[0046] It is a feature of the present matter that the exhaust gas leaving the power unit enters the first portion of the discharge pipe. Additionally, at least a portion of the exhaust gas passes into a gap, which is formed substantially radially between the first portion and the treatment device. The exhaust gas entering the gap assists in the rapid heating of the preliminary treatment device, whereby it achieves early quenching. As the gap formed annularly away from the treatment device allows the exhaust gas to heat the treatment device from the annular direction outwards.

[0047] It is a further feature of the present matter that the treatment device, in one embodiment, is disposed between a first ply and a second ply. Furthermore, the downpipe passes through the first bend with an upper circumferential portion/surface thereof, subsequent to the first bend being disposed a first distance from an imaginary horizontal line passing through an upstream peripheral end. The first distance is reached by the submembers that have the shortest radius of curvature in the first bend. Unlike a tubular member which is cumbersome to provide more pronounced bends.

[0048] It is still a further feature that the first portion has a lower circumferential portion/surface, taken subsequent to the first fold, disposed at a second distance from the imaginary horizontal line through which the second distance is maintained closer to the exhaust port through of which the exhaust system, despite being on the down-facing side of the IC engine, offers optimal ground clearance.

[0049] In one embodiment, the discharge system is attached to the power unit being of the forward angled type and the power unit is oscillatingly mounted to a frame member via a toggle link.

[0050] In one embodiment, the primary treatment device has a volume greater than a volume of the primary treatment device. In this way, the primary treatment device is accommodated comfortably in the silencer and the preliminary treatment device is accommodated in the discharge pipe.

[0051] However, the scope of the present matter is not limited to an exhaust system that has a preliminary treatment device arranged in the discharge pipe and the primary treatment device arranged in the silencer. As is applicable to a discharge system which has one of the primary treatment device or the preliminary treatment device being arranged in the discharge pipe and the other of the primary treatment device or the preliminary treatment device being arranged in the first portion, as the first portion is capable of accommodating any of the treatment devices.

[0052] In one embodiment, the discharge pipe has a first portion formed by one or more sub-member(s), which is capable of accommodating a treatment device. The treatment device includes a sleeve supporting a substrate, wherein the sleeve is provided with an upstream extending portion formed upstream of the substrate. The substrate of the treatment device normally supports catalytic material and the substrate is also referred to as 'catalyst support'. The substrate is capable of offering a large surface area. For example, the substrate may have a honeycomb structure. The extended upstream portion forms a hollow region upstream of the substrate and a first strength member is provided therein. The first resistance member decelerates the exhaust gas reaching the first resistance member and causes the exhaust gases to flow therethrough. In one implementation, the first resistance member includes a plurality of perforations through which the exhaust gases flow, causing a uniform flow of gases with improved uniformity index at all flow rates. The uniformity index/flow uniformity index provides the distribution of an amount, which is the exhaust gas herein, around a surface. In this way, the entire utilization of the treatment device is achieved due to the substantially uniform flow of gases instead of one region. Furthermore, such an improvement in flow uniformity index improves the heat distribution in the discharge pipe.

[0053] In one embodiment, the treatment device is provided with an extended downstream portion provided downstream of the substrate. A second resistance member is provided at the downstream end portion of the treatment device to further reduce the exhaust gas velocity to improve exhaust gas treatment by improving the time spent in the treatment device.

[0054] In a preferred embodiment, the second strength member is provided with perforations integrally formed with the sleeve. This also allows for early erasure handling, especially during cold boot conditions. In addition, the second resistance member is supplied selectively depending on the IC motor back pressure.

[0055] In one embodiment, the treatment device is configured to support a sensor member mounted in a sleeve thereof. In one implementation, the sensor member is mounted to the extended upstream portion of the sleeve via a mounting bracket to provide oxygen content information to regulate engine related parameters such as air-fuel mixture etc.

[0056] The sensing member is rigidly supported and securely supported by the sleeve without compromising the structural rigidity of the discharge pipe. Furthermore, in one implementation, the first portion at least partially surrounding the treatment device is provided with a hole to allow a mounting bracket to be attached to the sleeve therethrough. The sensing member is provided subsequent to the first resistance member and the uniform flow of exhaust gas improves the sensitivity or detection of oxygen information.

[0057] The first resistance member disposed upstream of the substrate and the sensing member protect them from any impulsive heat spikes, thus improving the reliability of the system. Furthermore, the improved exhaust flow uniformity index provides improved surface uniformity whereby utilization of the entire treatment device region is achieved, thus reducing early depletion of a particular region of the substrate. As the early depletion of even a certain region of the substrate requires replacement of treatment device or, in some cases, replacement of the entire discharge system, which is addressed by the present subject.

[0058] In one embodiment, the treatment device is supported by the first portion, wherein an annular ring is provided to cantilever support the treatment device. Preferably, the annular ring is made of a non-thermal conductive material or a material with low thermal conductivity, thus eliminating any heat conduction from the treatment device to the first portion. In this way, the first portion acts as a housing for the treatment device and at the same time is kept in isolation from the treatment device.

[0059] ???

[0060] These and other advantages of the present matter would be described in greater detail in combination with the figures in the following description.

[0061] Arrows, when provided in the upper right corner of the drawings, depict the direction relative to the vehicle, where an F arrow denotes forward direction, an R arrow indicates rearward direction, an UP arrow denotes upward direction, a DW arrow denotes downward direction, an arrow RH denotes right side, and an arrow LH denotes left side.

[0062] Figure 1 represents an exemplary motor vehicle 100, in accordance with an embodiment of the present matter. Vehicle 100 has a frame member 105 that includes a head tube 106, a main frame 107 that extends rearwardly down the head tube 106. The main frame 107 may comprise one or more main tube(s) , and a pair of trailing tubes 108 that extend slanted rearward from a rear portion of the main tube. In the present embodiment, the vehicle 100 includes a stepped portion 109 defined by the frame member 105 of the vehicle 100. However, the aspects of the present subject are not limited to the model of the depicted vehicle 100.

[0063] In addition, a handlebar assembly 110 is connected to a front wheel 115 through one or more front suspensions 120. A driving rod (not shown) connects the handlebar assembly 110 to the front suspension(s) 120 and the driving rod is rotatably supported around the head tube 106. The power unit 125 which includes an internal combustion (IC) is mounted to the frame member

105. The power unit 125 may also include a traction motor hub mounted or mounted adjacent to the IC motor. In the illustrated embodiment, the power unit 125 is disposed below at least a portion of the rear frame(s) 108. However, the power unit may be fixedly disposed to and below the main tube 107. In one implementation, the power unit 125 includes the IC motor, which is forward-tilted type, i.e., a piston axis (not shown) of the IC motor is forward-tilted. The power unit 125 is operatively connected to a rear wheel 130 via a transmission system (not shown). The vehicle may include one or more rear wheel(s). The transmission system includes either a continuously variable transmission (CVT), a fixed gear ratio transmission, or automatic manual transmission (AMT) controlled by an AMT control unit. In addition, vehicle 100 includes an air induction system (not shown) that supplies air to an air-fuel mixing unit (not shown). A fuel tank (not shown) stores and supplies fuel to the air-fuel mixing unit, where the air-fuel mixing unit can be a carburetor or a fuel injector throttle body. In addition, the vehicle 100 includes an exhaust system 200 which assists in the dissipation of exhaust gases from the IC engine. Discharge system 200 includes a silencer 135 mounted to vehicle 100. In the embodiment shown, silencer 135 is disposed toward a side side of vehicle 100.

[0064] In addition, the rear wheel 130 is connected to the frame member 105 through one or more rear suspensions (not shown). In the illustrated embodiment, the power unit 125 is pivotally mounted to the frame member 105 via a toggle link 150 or the like. A seat assembly 140 is supported by frame member 105 and arranged rearward to stepped portion 109.

[0065] In addition, the vehicle 100 includes a front fender 155 that covers at least a portion of the front wheel 115. In the present embodiment, a tread plate 145 is arranged in a staggered portion 109 and is supported by the main frame 107 and a pair of floorboards (not shown). The user can operate the vehicle 100 by resting his feet on the floor plate 145 in a seated position. In one embodiment, a fuel tank (not shown) is disposed below seat assembly 140 and behind the utility box. A rear fender 160 covers at least a portion of the rear wheel 135. The vehicle 100 comprises a plurality of electrical/electronic components that include a headlight 165, a tail light (not shown), a battery (not shown), a Transistor Control Ignition (TCI) unit (not shown), an alternator (not shown), a starter (not shown). In addition, vehicle 100 may include a synchronous braking system, an anti-lock braking system.

[0066] The vehicle 100 comprises a plurality of panels that include a front panel 170 disposed in a front portion of the head tube 106, a leg guard 171 disposed in a rear portion of the front tube 106. A rear panel assembly 172 includes a right side panel and a left side panel disposed below the seat assembly 140 and extending rearward from a rear portion of the floor plate 145 towards a rear portion of the vehicle 100. The rear panel assembly 172 surrounds a gearbox utilities arranged below the seat assembly 140. In addition, the rear panel assembly 172 partially surrounds the power unit 125. In addition, the exhaust system silencer 135 is coupled to the exhaust side of the IC engine and, in one implementation , the silencer 135 is disposed towards a side side of the vehicle 100.

[0067] Figure 2 illustrates a front perspective view of the power unit, according to an embodiment of the present matter. The power unit 125 of the present matter is the IC motor which is a forward inclined type. Furthermore, the IC motor is of the oscillating type which is oscillatingly connected to the frame member 105 of the vehicle 100 through a crankcase 181. The crankcase 181 is connected to the frame member 105 using a toggle link 150. One end of the toggle link 150 is connected to the lower portion of the crankcase 181 and the other end of the toggle link 150 is pivoted to the frame member 105.

[0068] In addition, the IC engine includes a cylinder portion defined by a cylinder block 180. The cylinder block 180 is mounted to a crankcase 181 of the IC engine. Cylinder block 180 supports a cylinder head 183 that includes a valve assembly. The valve assembly allows the inlet of the air-fuel mixture to the cylinder portion, where the combustion of the air-fuel mixture takes place. Subsequently, the valve assembly allows for the dissipation of EG burnt exhaust gases (as shown in Figure 7(c)) from the cylinder. The air induction system together with the fuel air supply system is connected to a side wall of cylinder head 183 which is provided with an inlet port (not shown). In addition, cylinder head 183 includes an exhaust port 184 provided on another side wall of the cylinder head.

183. In the present implementation, the inlet port is provided on the upper side wall of the cylinder head 183 and a fuel air regulation unit, which may include a carburetor or a fuel injector throttle body connected to the inlet port. Furthermore, in the present implementation, the exhaust port 184 is provided on the lower side wall of the cylinder head 183 and the exhaust system 200 is connected to the exhaust port 184. The IC engine includes a cooling cowl assembly 185 (shown partially) annularly surrounding at least a portion of the cylinder head 183, and the cylinder block 180. The exhaust system 200 includes an exhaust pipe 205 that operatively connects the cylinder head 183 to the silencer 135. In the present implementation, the silencer 135 is disposed laterally adjacent to rear wheel 130.

[0069] Figure 3 represents a perspective view of the right side of the discharge system 200, according to the embodiment of Figure 2. The discharge system 200 includes the discharge pipe 205 formed by a first portion 206 and a second portion 207, wherein the second portion 207 is disposed downstream of the first portion 206 with respect to the flow direction of the exhaust gas. The exhaust system 200 is connected to the exhaust port 184 (shown in Figure 2) through an upstream end portion of the exhaust pipe 205, hereinafter the upstream end portion of the exhaust pipe 205 is referred to as a first upstream end portion 208 thereof. Furthermore, the downstream end portion 205 includes a downstream end portion through which it is connected to the muffler 135, henceforth in the present document, the downstream end portion of the exhaust pipe 205 is referred to as a second downstream end portion. 216. The discharge system 200 includes a primary treatment device 210 disposed downstream of the preliminary treatment device 211 and the primary treatment device 210 that is disposed in at least one of the second portion 207 and a silencer 135. , the primary treatment device 210 is arranged within the silencer 135 to treat exhaust gases EG passing therethrough. The muffler 135 includes one or more mounting brackets 190, 191 for mounting the muffler 135 to the frame member 105. In addition, a preliminary treatment device 211 is disposed within the first portion 211 of the discharge pipe 205. EG exhaust gases exiting cylinder head 183 (shown in Figure 2) are treated by preliminary treatment device 211 and primary treatment device 210, thus allowing EG exhaust gases to dissipate from muffler 135 with minimal pollutants .

[0070] In the embodiment shown, the second portion 207 is a single tubular metallic barrel that has one end attached to the first portion 206 and the other end attached to an inlet portion of the silencer 135. The second portion 207 is capable of supporting at least one portion of the pre-treatment device 211 and the pre-treatment device 211 is substantially surrounded by the first portion 206. Thus, the pre-treatment device 211 is in minimal or no contact with the first portion 206 despite surrounding it. The second portion 207 is secured to the first portion 206 by welding or by any other known fastening mechanism. The second portion 207 is longer than the length of the first portion 206, where the term 'length' used herein refers to the actual length in the axial direction along the central contour axis of the exhaust system.

[0071] In one implementation, an overall conversion efficiency or output of the primary treatment device 211 is lower compared to an overall conversion efficiency or output of the primary treatment device 210. Consequently, the primary treatment device 210 has a volume greater than a volume of the preliminary treatment device 211. The primary treatment device 210 can be comfortably accommodated in the silencer 135 and the preliminary treatment device 211 is accommodated in the discharge pipe 205. However, the first portion 206 of the present matter can be adapted to accommodate the high volume primary treatment device 210 therein. Each of the treatment devices mentioned herein may be in the form of a single integrated member or a segregated member connected together or arranged with some spacing. Furthermore, the discharge system 200 is suspended from the vehicle via the first end portion 208 and the mounting brackets 190,

191.

[0072] Figure 4 represents an exploded view of a portion of the discharge system, according to the embodiment as represented in Figure 3. The second portion 207, which is a tubular metallic pipe, has a circular section, in the present embodiment, which has a second upstream end portion 215 connected to the first portion 206 through a clutch member 217 and another end, which is the second downstream end portion 216 connected to the muffler 135.

[0073] The first portion 206 is formed by one or more sub-members 221, 222. In the present embodiment, the first portion 206 is formed by two sub-members, namely, a first sub-member 221 and a second sub-member 222 that are partitioned in a plane along the along the contoured axis of the discharge pipe 205. Additionally, the first portion 206 includes a flange member 223 that is secured to the sub-members 221, 222 in an upstream portion. Flange member 223 holds the sub-members 221, 222 together at one end and also acts as a mounting member for mounting the exhaust pipe 205 to the IC motor. The first portion 206 is capable of surrounding at least a portion of the preliminary treatment device 211 with minimal or no contact therewith. In the present embodiment, the preliminary treatment device 211 is completely encircled, especially annularly, by the first portion 206. The first portion 206 acts as a housing for the preliminary conversion device 211 without actually supporting the device 211. Furthermore, the sub-members 221 , 222 allow to maintain a variable cross-sectional radius with sharp curvature subsequent to the upstream portion 208. Furthermore, the first portion 206 is connected to the second portion 207 by a downstream end portion of the first sub-member 221 and the second sub-member 222, which rest on the second upstream end portion 215 of the annularly adhered and abutting second portion 207.

[0074] In one embodiment, the second portion 207 includes the clutch member 217, wherein the clutch member 217 acts as an interface element between the second portion 207 and the preliminary treatment device 211. Thereby, the treatment device preliminary 211 is cantilevered to the second upstream end portion 215, wherein an end 218 (shown in Figure 6) of the treatment device is mounted to the second upstream end portion 215. The first downstream end portion 209 of the first portion 206 rests on/is secured to second upstream end portion 215. Another end 219 of pretreatment device 211 secures outwardly or is suspended from clutch member

217. Consequently, the preliminary treatment device 211 is not in direct contact with the first portion 206 and is substantially supported by the second portion.

207.

[0075] Figure 5 represents a portion of the downpipe with selected parts, according to the embodiment of Figure 4. The second portion 207 is provided with the clutch member 217, in which the second upstream end portion 215 is inserted at least partially on the clutch member 217 and is secured thereto. The fastening means will preferably be welding, but may also include other fastening means known as interference fit, press fit or the like, depending on material or manufacturing requirements. Furthermore, the preliminary treatment device 211 (shown in Figure 4) is at least partially supported by the clutch member 217 on the other side. Clutch member 217 may be adapted to have non-uniform diameter, say, a first diameter on the downstream side for receiving the second upstream end portion 207 thereof and a second diameter on the upstream side for cantilever mounting of the clutch device. preliminary treatment 211. The clutch member 217 has a tapered profile in the downstream direction, in accordance with the illustrated embodiment. Furthermore, the cantilever mounted pretreatment device 211 is substantially annularly engaged by the first portion 206 and the clutch member 217 is at least partially annularly evolved by the first portion 206, thereby rigidly supporting the pretreatment device 211 and also providing a tight seal for the EG exhaust gases.

[0076] Figure 6 represents another portion of the discharge pipe with selected parts, according to the embodiment of Figure 4. The first portion 206 formed by the first sub-member 221 and the second sub-member 222, according to the embodiment shown, is separated in a vertical plane along a geometric axis A-A' thereof. In the current embodiment, the first sub-member 221 and the second sub-member 222 are symmetrical. However, asymmetrical sub-members may be used due to design/fabrication/welding or any other feasibility. The first sub-member 221 and the second sub-member 222 may be of a sheet metal part, a cast part, or an FRP part that are held together by welding or the like. In addition, the flange member 223 (shown in Figure 4) is welded to the first upstream end portion 208 of the first portion 206, wherein the upstream end portion forms a substantially circular cross-section and the flange member 223 is capable of holding the two sub-members 221, 222 together by receiving at least a portion thereof. Furthermore, the downstream end portion of the sub-members 221, 222 encircle the clutch member 217 and are secured thereto.

[0077] In addition, the first portion 206 has a bend profile that has one or more bends through which the direction of extension of the discharge pipe 205 is changed. In case the IC engine is provided with an exhaust port 184 on a downward facing side of the cylinder head 183, the bend profile allows for the extension of the exhaust pipe 205 to the side and back towards the silencer 135. , in case the IC motor has a substantially vertical or inclined piston axis, the first portion is provided with at least one bend adapted to extend in a downward and sideways direction.

[0078] Figure 7 (a), Figure 7 (b), and Figure 7 (c) show cross-sectional views of the exhaust pipe 205, taken, along the axes B-B', C-C', and D-D', respectively, of the discharge pipe 205, are shown in Figure 7(a). Axis B-B' is taken substantially along a mid-portion of the short axis of the first portion 206. The sectional view taken along the axis B-B' represents a span 230 (also marked in the sectional view in D-D') between the first portion 206 and the preliminary treatment device

211. In one embodiment, the gap 230 is maintained in the range of 5 to 15% of a radius of the tailpipe 205 (socket near port 184) that provides sufficient clearance for the passage of EG exhaust gases while at the same time , maintains the optimal size of the tailpipe 205 to be mounted to a forward angled engine. Furthermore, the first portion 206 acts as a cover for the pre-treatment device 211, wherein the first portion 206 is annularly arranged around the pre-treatment device 211 without contacting or with minimal contact therewith, forming the gap. 230. Exhaust gases EG leaving exhaust port 184 flow through preliminary conversion device 211. In addition, gap 230 allows exhaust gases EG to flow around preliminary treatment device 211. Gap 230 is annularly formed around the preliminary treatment device whereby the exhaust gases EG which are hot surround the preliminary treatment device 211, thus heating the preliminary treatment device 211 from the outside, leading to early quenching. Furthermore, the gap 230 has only one entry-exit point, which is in the upstream portion of it, thus causing the EG exhaust gases entering the gap 230 to remain for a longer duration, causing rapid heating, even during the cold start.

[0079] Furthermore, the sectional view taken on the axis C-C', which is taken substantially at the downstream end portion of the first portion 206, represents the second portion 207 being surrounded by the clutch member 217, which is further surrounded by the first portion 206. Thereby, the clutch member 217 is sandwiched securely between the second portion 207 and the first portion 206, and the clutch member 217 can rigidly support the preliminary treatment device 211.

[0080] Furthermore, a sectional view taken along the axis D-D' represents the sectional view of the discharge pipe 205 taken along the axis of the same. First portion 206 includes flange member 223 which is secured to an upstream end portion thereof, wherein flange portion 223 is provided with one or more mounting holes (not shown) for connecting to cylinder head 183 In addition, the flange member 223 includes an upstream cylindrical end that engages with an exhaust port 184 of the power unit 125. The upstream cylindrical end, according to one embodiment, is of the protruding type, i.e., adapted to receive through the exhaust port. In another embodiment, the upstream cylindrical end is of the hollow cylindrical type, which may receive a protruding type exhaust port.

[0081] The first sub-member 221 and the second sub-member 222 are C-shaped (also shown in Figure 4) that are connected to each other through peripheral edges, through which the two C-shaped sub-members, C1 and C2 in condition assembled, define a volume between accommodating the preliminary treatment device 211, at least a portion of the clutch member 217, and the second upstream end portion 215 of the second portion 207. The plane P1, which is at the junction of the peripheral edges, may be passing through their geometry axis, or arranged in a geometry axis compensation. The cross-section of the sub-member is not limited to the C-section and may include any regular or irregular geometric sections known to accommodate the treatment device. The first portion 206 undergoes a subsequent first bend 240, whereupon the downpipe 205 undergoes a change in orientation and the preliminary treatment device 211 can be accommodated immediately after the first bend.

[0082] As shown in the sectional view taken along the geometric axis D-D', the first sub-member 221 and the second sub-member 222 are provided with a curved profile to form the first fold 240. In the present embodiment, each of the first sub-members 221 and second sub-member 222, have a first radius of curvature 231 and a second radius of curvature 232 respectively, taken at the angled portion of the first bend 240, wherein the first radius of curvature 231 inwardly is less than the second radius of curvature 232. The ratio of the second radius of curvature 232 to the first radius of curvature 231 is in the range of 3 to 8 which provides a sharp angular profile without compromising structural rigidity.

[0083] Further, if moving in a downstream direction of flow of exhaust gases EG through the first portion 206, the radius of the first portion 206 increases to the first bend 240 and is then stabilized at the central portion thereof. The stabilized radius will be substantially equal to a sum of a radius of the preliminary treatment device 211 and the span 230. The second radius of curvature 232 may be modified by which the resulting stabilized radius of the second portion 206 is capable of accommodating the treatment device. pretreatment 211 and still maintaining gap 230. Gap 230 allows for heating of pretreatment device 211 by allowing exhaust gases EG to flow around. Furthermore, the first downstream end portion 209 of the first portion 206 abuts the clutch member 217 which supports the preliminary treatment device 211 being cantilevered to the clutch member 217. In other words, an end 218 of the treatment device preliminary 211 is supported by clutch member 217, which in turn is supported by second portion 207. In another implementation, clutch member 217 may be integrally formed with second portion 207, wherein end-to-end second portion mount 215 is machined to provide operation of clutch member 217.

[0084] Therefore, the EG exhaust gases leaving the power unit 125 enter the exhaust pipe 205 through the first portion 206. The EG exhaust gases pass through the preliminary treatment device 211 where it undergoes treatment similar to gas oxidation. Additionally, at least a portion of the exhaust gases EG passes into the gap 230, which is formed substantially around the pre-treatment device 211, whereby it heats the pre-treatment device 211 quickly. In this way, the EG exhaust gases passing through the pre-treatment device 211 and entering the gap 230 holistically result in rapid heating of the pre-treatment device 211 without the need for any additional components such as heating elements, which make the system bulkier, requiring high currents, and adding to the cost of the system. In this way, the preliminary treatment device 211 achieves early quenching, thus effectively treating the EG exhaust gases.

[0085] Figure 8 shows the treatment device conversion efficiency versus time. Line B represents the conversion efficiency of the treatment device according to the discharge system of the present matter. The conversion efficiency of the 211 treatment device reaches its maximum efficiency quickly after starting the IC motor. The treatment device 211 reaches its maximum efficiency in a time t2, which is earlier than a time t1 required to reach maximum efficiency in the case of an exemplary conventional system. Thus, the present material offers fast heating within a time t2 which offers an advantage of Δt. Furthermore, the slope of line B is steeper compared to line A (conventional system) which implies that the conversion efficiency is dramatically increased immediately after starting the IC motor and also reaches maximum conversion efficiency beforehand. Additionally, no direct connection between the pretreatment device 211 and the first portion 206, which acts as the covering/covering means thereof, assists in minimizing heat loss from the preliminary treatment device 211 as well as any damage from high temperatures. & durability issues related to heat conduction. Consequently, the preliminary treatment device 211 achieves thermal equilibrium faster by providing optimal performance thereof.

[0086] In the illustrated embodiment, the first portion 206, subsequent to the first fold 240, has an upper circumferential portion 226 disposed at a first distance 235 from an imaginary horizontal line 236 passing through an upstream peripheral end. The first distance 235 is smaller, so that the first portion 206 offers sharp bending offer orientation change while retaining the ability to accommodate the treatment device 211. The first distance 235 can be maintained in the range of 5 to 125 millimeters. Furthermore, the downpipe 205 has a lower circumferential portion 227, taken subsequent to the first bend 240, at a second distance 237 from the imaginary horizontal line.

236. The second distance 237 is maintained in the range of 50 to 175 millimeters, which provides optimal ground spacing between the discharge pipe 205 and the ground, despite accommodation of the treatment device 211 therein.

[0087] The downpipe 205 undergoes the first bend 240, wherein the first portion 206 of the downpipe 205 extends substantially in the lateral direction. In this way, the downpipe 205 does not extend into the toggle link portion 150. Subsequently, the downpipe 207 undergoes a second bend (not shown) through which the downpipe 205 extends toward the muffler.

135. In addition, the first portion 206 allows the preliminary treatment device 211 to be accommodated therein in proximity to the exhaust port 184 immediately after the first fold 240 maintains it close to the exhaust port 184 for early erasure. At the same time, the extension of the exhaust pipe 205 in the lateral direction and in the direction of the ground is optimized.

[0088] In one embodiment, the power unit 125 comprising the motor IC is of the forward inclined type, which has a piston axis, also analogous to a cylinder axis, which is forward inclined. In addition, cylinder block 180 (shown in Figure 2) is supported by crankcase 181 which is comprised of two or more parts. In addition, cylinder head 183 mounted to cylinder block 180 (shown in Figure 2) includes exhaust port 184 to which exhaust system 200 is connected. In the present embodiment, the flange member 223 (as shown in Figure 4) is secured to the exhaust port 184. The exhaust pipe 205 extends towards a silencer 135 disposed to the left or to the right of a center. motor vehicle side

100. In one embodiment, silencer 135 may be disposed, at least partially, along the lateral center. The downpipe 205 includes a first portion 206 and a second portion 207, and the second portion 207 substantially supports the pre-treatment device 211, which is surrounded by the first portion 206. The pre-treatment device 211 is cantilevered to the second. portion 206. The first portion 206 allows for rapid heating of the treatment device 211 due to the gap 230. Furthermore, the first portion acts as a housing for the treatment device 211.

[0089] Figure 9 represents a sectional view of a portion of the discharge system, taken along the geometric axis X-X', according to a second embodiment of the present matter. The discharge system 300 includes a downpipe 305 formed by a first portion 306 and a second portion 307. The first portion 306 is formed by one or more sub-members 321, 322. In the present embodiment, the first portion 306 is formed by a first sub-member 321 and a second sub-member 322 which are partitioned in a plane along the geometric axis of the discharge pipe 305. The first portion 306 is capable of surrounding at least a portion of a treatment device 311, wherein one of the first portion 306 and second portion 307 support treatment device 311 with minimal contact. In the embodiment shown, the second portion 307 supports the treatment device 311. Furthermore, the first portion 306 is connected to the second portion 307 by an end portion downstream thereof. The second portion 307 includes a clutch member 317, wherein the clutch member 317 acts as an interface element between the second portion 307 and the first portion 306. Further, in one embodiment, the treatment device 311 is supported by the second portion 307 and the first portion 306. clutch member 317 (not shown). An annular ring 360 is provided to provide cantilever support to the treatment device 311 with minimal or no contact with the first portion 306. Preferably, the annular ring 360 is made of a thermally non-conductive material or a material of low conductivity, eliminating thus any heat conduction from the treatment device 311 to the first portion 306.

[0090] The annular ring 360 further defines a gap 330 between the treatment device 311, to be precise between the sleeve 312 and the inner periphery of the first portion

306. In addition, annular ring 360 blocks the flow of EG exhaust gases from span 330 towards downstream of annular ring

360. Thereby, annular ring 360 is disposed at a portion where substrate 313 terminates. Thereby, the gap 330 extends to the region that the substrate 313 extends, thereby causing the entire substrate 313 to heat up without any external heating elements.

[0091] In the current embodiment, clutch member 317 has a tapered diameter in a downstream direction. An upstream end portion 315 of the second portion 307 is attached to an inner periphery of the clutch member 317 and an upstream end portion of the clutch member 317 is attached to the downstream end portion of the second portion 307. Specifically, the The upstream end portion of the clutch member 317 is secured to the downstream end portion of the first portion 306.

[0092] Further, in one embodiment, the treatment device 311 includes a sleeve 312 that supports a substrate 313. In one embodiment, the substrate 313 is adapted to match the structural profile of the sleeve 312, which is preferably circular/cylindrical. . Substrate 313 may have a honeycomb (inner) structure with precious metal(s) such as platinum, palladium, rhodium or similar materials loaded into the reduction process. The sleeve 312 includes an upstream extending portion 314 that extends in an upstream direction therefrom beyond a portion upon which the substrate 313 is supported. The first portion 306 formed by the sub-members 321, 322 allows accommodation of the elongate treatment device 311 and also provides cantilever mounting.

[0093] Furthermore, the discharge system 300 is provided with a first resistance member 365 mounted to the treatment device 311 at an end portion thereof in an extended upstream portion 314. The sub-members 321, 322 which form the first portion allow accommodation of treatment device 311 in proximity to flange member 232/exhaust port 184 (shown in Figure 2) due to the rapid/sharp increase in diameter of the first portion immediately subsequent to exhaust port 184 (shown in Figure 2 ). Exhaust gases EG flowing at high velocity from the exhaust port to the exhaust system 300 enter the first portion 306 and contact the first resistance member 365.

[0094] Firstly, the first resistance member 365 decelerates the exhaust gas velocity

EG passing through there, wherein the attachment of exhaust gases EG to a portion of the wall of the first portion 306 is interrupted. The first portion 306 with a larger second radius of curvature 232 (as explained in Figure 7(c)) can cause flow clamping away from the exhaust port.

184. The present matter with the first portion 306 in combination with the treatment device 311 causes the exhaust gases EG passing through the perforations, provided in the first resistance member 365, whereby the use of uniform surface of the device of 311 handling is improved. Furthermore, this also leads to an increase in the time taken by the EG exhaust gases passing through the substrate 313 due to the reduced velocity. Furthermore, this additionally leads to the premature shutdown of the treatment device 311 due to the retention of hot exhaust gases EG for longer. In one embodiment, the first resistance member 365 has an area of perforated holes equivalent to 50 to 80% of the total frontal area/face area of the treatment device 311, which aids in optimal interruption of high velocity gases flowing along the along a certain region, thus causing uniform flow through the perforations.

[0095] Figure 10 (a) represents another implementation of the present matter, according to an embodiment. In the present embodiment, the treatment device 311 is configured to support a sensor member 345 on the extended upstream portion 314. In the illustrated embodiment, the sensor member 345 is mounted to an extended upstream portion 314 via a mounting bracket.

350. The first portion 306 is provided with a hole 355 to allow a mounting bracket 350 to be attached to an extended upstream portion 314 of the treatment device.

311. Mounting bracket 350 may be a cylindrical peg or mounting protrusion, which is attached to an extended upstream portion 314 and in one embodiment, partially enters the inner hollow region of treatment device 311. Further, a sensing member 345, such as a lambda sensor, an oxygen sensor, or the like, is attached thereto, extending into the inner hollow region. The annular ring 360 is disposed at a portion where the substrate 313 terminates. Thereby, the gap 330 extends to the region that the substrate 313 extends, thereby causing the entire substrate 313 to heat up without any external heating elements. In addition, sensor member 345 undergoes rapid heating due to exhaust gases EG passing through gap 330.

[0096] In addition, the inner edges 356 of the hole 355 are bent inwardly so that they abut an outer periphery of the sleeve 312 whereby it acts as a seal, restricting any escape of EG exhaust gases therethrough. This allows the sensing member 345 to be mounted immediately after a first upstream end portion 308 of the exhaust pipe 305 with a predetermined gap. This allows the sensing member 345 to be ideally mounted in proximity to the exhaust port 184 to provide the oxygen content information leaving the exhaust port 184. Furthermore, the turbulence around the sensing member 345 caused due to the first resistance member 365 improves the sensitivity or detection of oxygen information. Additionally, the first resistance member

365 (as shown in Figure 9) protects sensor member 345 and treatment device 311 from any impulsive heat spikes that may occur during various engine operating conditions.

[0097] In addition, an annular ring 360 is provided to provide cantilever support for the treatment device 311. Preferably, the annular ring 360 is made of a thermally non-conductive material or a material of low conductivity, thus eliminating any conduction of heat treatment device 311 to first portion 306. Thereby, treatment device 311 is cantilevered to second portion 307 of exhaust pipe 305 or cantilevered to annular ring 360, eliminating the need for any mounting scheme additional. The first portion 306 is formed by the first sub-member 321 and a second sub-member 322 that are partitioned in a plane along a geometric axis of the discharge pipe 305. In this way, the first portion 306 is capable of enclosing at least a portion of the device. treatment device 311 and also support it through the annular ring 360, thus offering an efficient design with minimal connections, especially to support the treatment device 311.

[0098] Figure 10 (b) represents yet another implementation of the discharge system of the present matter. The discharge system 301 is provided with a first resistance member 365 mounted to the treatment device 311 at an upstream end portion thereof. Exhaust EG gases flowing at high velocity from the exhaust port to the exhaust system enter the first portion 306 and contact the first resistance member 365 which is adapted to decelerate the velocity of the EG exhaust gases passing through. from there. Furthermore, the first resistance member 365 has passage portions like perforations through which the exhaust gases EG pass at uniform velocity. This also helps to keep the temperature even in the first 306 serving.

[0099] Figure 11 represents a discharge system 400, according to another embodiment of the present matter. Figure 12 represents an exploded view of the discharge system 400. The discharge system 400 according to the embodiment shown includes a discharge pipe 405 formed by a first portion 406 and a second portion.

407. The first portion 406 is formed by one or more sub-members 421, 422. Further, in one embodiment, the treatment device 411 includes a sleeve 412 that supports a substrate 413. The treatment device 411 is configured to support a member. sensor 345 in the extended upstream portion 414, which is formed in an upstream portion of the substrate 413. The treatment device 411 is supported by an annular ring 460, wherein the treatment device 411 is cantilevered, supported by the annular ring

460. However, in one embodiment, a clutch member 417 supports the treatment device 411 in a cantilevered fashion. The cantilever mounting of the treatment device 411 reduces the number of connection points and the reduced contact portion through the first portion 406 which provides thermal insulation. In one embodiment, the sensing member 345 is mounted to the treatment device 411 at the upstream extended portion 414 via a mounting member 350. As shown in Figure 12, one of the sub-members, which is the second sub-member 422 in which case is provided of a hole 455 for mounting the mounting member 350 therethrough.

[0100] In addition, the discharge system 400 is provided with a first resistance member 465 mounted on the treatment device 411 at an end portion thereof. Exhaust gases EG flowing at high velocity from the exhaust port to the exhaust system enter first portion 406 and contact first resistance member 465. In one embodiment, first resistance member 465 has an area of drilled holes equivalent to 50 to 80% of a total frontal area of the treatment device 411. First, the first resistance member 465 decelerates the velocity of the exhaust gases EG passing therethrough. This leads to an increase in the time taken by the EG exhaust gases passing through the substrate 413 due to the reduced velocity. Furthermore, this additionally leads to early erasure of the treatment device 411.

[0101] Furthermore, in the illustrated embodiment, the treatment device 411 includes a downstream extending portion 475 formed downstream of the substrate 413. In addition, the downstream extending portion 475 is provided with a second strength member 466. The second strength member 466 may be a perforated plate, perforated cylinder or the like. In the embodiment shown, the second strength member 466 is formed as a perforated cylindrical member. In other words, the second strength member 466 can be formed internally with the downstream extending portion 475 and a stop plate 480 is provided at the downstream end of the treatment device 411.

[0102] As depicted in Figure 13, an L2 line representing the uniformity index at various IC motor flow rates in accordance with the present matter. As shown, the present material offers a Δ γ improvement of the uniformity index, thus providing improved detection of oxygen content information. As the discharge pipe 205, 305, 405 allows the accommodation of the treatment device 211, 311, 411 even with the extended portions due to the sub-members 221, 222, 321, 322, 421, 422 that provide a variable and agile diameter and with sharp orthogonal curve to accommodate the treatment device 211, 311, 411 therein. In addition, the flexible and variable diameter first portion 206, 306, 406 which flares in a downstream direction allows for the accommodation of the resistance member 365 snugly in the upstream portion of the substrate 213, 313, 413 thus allowing exhaust gases EG that pass along a certain portion of the exhaust pipe 205, 305, 405 spread over the area of the treatment device 211, 311, 411. In addition, the first resistance member allows the exhaust gases EG to pass through there at a uniform rate and the sensor member 345 disposed subsequent to the first resistance member 365 is capable of providing non-fluctuating oxygen content data, thus allowing the regulation of the air-fuel mixture. Thus, the first portion 206, 306, 406 in combination with the sensor member 345 mounted to the treatment device 211, 311, 411 improves oxygen detection with minimal fluctuation.

[0103] Thereby, the subsequent EG exhaust gases passing through the substrate 413 reach the radially provided perforations in the extended downstream portion 475 whereby a further reduction in velocity of the EG exhaust gases is achieved, thus allowing efficient utilization of the treatment device. In one implementation, a total area of all holes drilled provided in all strength members is equivalent to 100 to 150% of the total front area of an axial face/front face of the treatment device 522. Thus, provision in such 465/466 strength members allow the EG exhaust to have substantial time in the substrate portion, leading to efficient treatment of the EG exhaust. Furthermore, the retention of EG exhaust gases over the substrate region allows the treatment device to achieve early blanking. Resistance member(s) 465, 466 allows for improved surface uniformity and uniformity of EG exhaust gases entering the treatment device therethrough. Thus, instead of the specific region of the substrate 413 of the treatment device 411 being used, an entire area of the substrate is used.

[0104] It should be understood that aspects of modalities are not necessarily limited to the features described in this document. Many modifications and variations of the present matter are possible in light of the above disclosure. Therefore, within the scope of the claims of the present matter, the present disclosure may be practiced otherwise than specifically described. LIST OF REFERENCE SIGNALS:

100 vehicle 105 frame member 106 front tube 107 main frame 108 rear frame 109 step space 110 handlebar assembly 115 front wheel 120 front suspension 125 power unit 130 rear wheel 135 muffler 140 seat mount 145 floor plate 150 toggle link 155 front fender 160 rear fender 165 headlight 170 front panel 171 leg guard 172 rear panel assembly 180 cylinder block 181 crankcase 182 toggle link 183 cylinder head 184 exhaust port 190 mounting member 200/300/ 301/400 discharge system 205/305/405 discharge pipe 206/306/406 first portion

207/307/407 second portion 208/308 first upstream end portion 209 first downstream end portion 210 primary treatment device 211/311/411 preliminary treatment device 312/412 sleeve 313/413 substrate 314/414 extended portion upstream 215 second upstream end portion 216 second downstream end portion 217/317/417 clutch member 221/321/421 first sub-member 222/322/422 second sub-member 223/323/423 flange member 226 upper circumferential portion 227 lower circumferential portion 230/330 span 231 first radius of curvature 232 second radius of curvature 235 first distance 236 horizontal line 237 second distance 240 first bend 345 sensor member 350 mounting bracket 355/455 hole 356 inner edge 360/460 annular ring 365 /465 first resistance member 466 second resistance member

475 downstream extended portion 480 exhaust gas EG stop member

Claims (23)

1. Discharge system (200, 300, 301, 400) for a motor vehicle (100), said discharge system (200, 300, 301, 400) being connected to a power unit (125) of the said motor vehicle (100), said exhaust system (200) being characterized in that it comprises: an exhaust pipe (205, 305, 405), said exhaust pipe (205, 305, 405) formed by a first portion ( 206, 306, 406) and a second portion (207, 307, 407), said first portion (206, 306, 406) being connected to an exhaust port (184) of said power unit (125) via of a first upstream end portion (208, 308, 408) thereof, said second portion (207, 307, 407) disposed downstream of said first portion (206, 306, 406), one of said first portion (206, 306, 406) and said second portion (207, 307, 407) is adapted to support a treatment device (211, 311, 411), and said first portion (206, 306, 406) capable of to wrap in an annular fashion, at least parc namely, said treatment device (211, 311, 411), and said first portion (206, 306, 406) includes a first downstream end portion (209) secured to said second portion (207, 307, 407) . A discharge system (200, 300, 301, 400) according to claim 1, characterized in that said first portion (206, 306, 406) provides at least one partial annular gap (230, 330) formed between the said treatment device (211, 311, 411) and an inner periphery of said first portion (206, 306, 406). Discharge system (200) according to claim 1, characterized in that said second portion (207) includes a second upstream end portion (215), and said treatment device (211) is cantilevered to the second upstream end portion (215), and wherein one end (218) of said treatment device (211) is supported by said second upstream end portion (215) and another end (219) of said treatment device (211) projects out of it. Discharge system (200) according to claim 1, characterized in that said second upstream end portion (215) includes a clutch member (217), said treatment device (211) being cantilevered. to the clutch member (217), and said clutch member (217) integral with the second downstream end portion (216). Discharge system (200) according to claim 1, characterized in that said treatment device (211) cantilevered to said second upstream end portion (215) acts as a preliminary treatment device (211) having an overall conversion efficiency less than an overall conversion efficiency of a primary treatment device (210), and said primary treatment device (210) disposed downstream of said preliminary treatment device (211). Discharge system (200) according to claim 5, characterized in that said primary treatment device (210) is arranged in at least one of said second portion (207) and a silencer (135). Discharge system (200) as claimed in claim 1, characterized in that said treatment device (211) acts as a primary treatment device that has an overall conversion efficiency greater than an overall conversion efficiency of a discharge device. preliminary treatment arranged downstream of said primary treatment device. Discharge system (300, 301, 400) according to claim 1, characterized in that said discharge system (300, 301, 400) includes an annular ring (360) adapted to cantilever said treatment device. (311, 411) over said first portion (306, 406), and said second portion (307, 407) includes a clutch member (317, 417) that acts as an interface element between said first portion (306, 407) 406) and said second portion (307, 407). A discharge system (200, 300, 301, 400) according to claim 1, characterized in that said first portion (206, 306, 406) is formed by one or more sub-member(s), wherein said one or more sub-member(s) includes a first sub-member (221, 321, 421) and a second sub-member (222, 322, 422) divided at least along an axis (A-A') of said first portion ( 206, 306, 406), and each of said first sub-member (221, 321, 421) and said second sub-member (222, 322, 422) are curved outward, and said first sub-member (221, 321, 421) and said second sub-member (222, 322, 422), in the joint condition, define a volume therein to accommodate said treatment device (211, 311, 411). A discharge system (200, 300, 301, 400) according to claim 9, characterized in that said first portion (206) includes a first fold (240), said first sub-member (221) being disposed substantially upwards with respect to said second sub-member (222), said first sub-member (221), having a first radius of curvature (231) to form said first bend (240), and said second sub-member (222) includes a second radius of curvature (232) to form said first bend (240), and said second radius of curvature (232) is substantially greater than said first radius of curvature (231). Discharge system (200) according to claim 1, characterized in that said discharge pipe (205) includes one or more bends (240), said treatment device (211) being disposed substantially between a first bend (240) and a second fold thereof. A discharge system (200, 300, 301, 400) according to claim 1, characterized in that the first portion (206, 306, 406) includes a flange member (223, 323, 423) provided in said first portion. (208, 308), said flange member (223, 323, 423) at least partially supporting a first sub-member (221, 321, 421) and a second sub-member (222, 322, 422) of said first portion (206, 306, 406), wherein said flange portion (223, 323, 423) includes an upstream cylindrical end adapted to engage with an exhaust port (184) of the power unit (125) . Flushing system (200) according to claim 8, characterized in that the first sub-member (221) and said second sub-member (222) have a first radius of curvature (231) and a second radius of curvature (232) respectively, taken at an angled portion of a first bend 240 of said first portion (206), and a ratio of said second radius of curvature (232) to said first radius of curvature (231) is in the range of 3 to 8. Discharge system (200) according to claim 1, characterized in that the first portion (206), subsequent to a first fold (240), has an upper circumferential portion (226) arranged at a first distance (235) of an imaginary horizontal line (236) passing through said first upstream end portion (208) of said first portion (206), and a lower circumferential portion (227) disposed at a second distance (237) from the imaginary horizontal line (236) passing through said first upstream end portion (208) of said first portion (206). 15. Discharge system (300, 301, 400) for a motor vehicle (100), said discharge system (300, 301, 400) being connected to a power unit (125) of said motor vehicle (100), the discharge system (300, 301, 400) is characterized in that it comprises: a discharge pipe (305, 405), said discharge pipe (305, 405) being formed by a first portion (306 , 406) and a second portion (307, 407), said first portion (306, 407) is connected to an exhaust port (184) of said power unit (125) through the first upstream end portion (308). , 408) thereof, said second portion (307, 407) is disposed downstream of said first portion (306, 406), one of said first portion (306, 406) and said second portion (307, 406) being 407) is adapted to support a treatment device (311, 411), said first portion (306, 407) capable of annularly enclosing, at least partially, said treatment device (311, 411), and said first portion (306, 406) includes a first secured downstream end portion to said second portion (307), and said treatment device (311, 411) includes a substrate (313, 413) supported by a sleeve (312, 412) thereof, said sleeve (312, 412) is configured to supporting a sensor member (345) disposed upstream of said substrate (313, 413). A discharge system (300, 301, 400) according to claim 15, characterized in that said sleeve (312, 412) of said treatment device (311) includes an upstream extending portion (314, 414) provided in an upstream end thereof, and said sensing member (345) is secured to said extended upstream portion (314, 414) A flushing system (300, 301, 400) according to claim 15, characterized in that said sensing member (345) is secured to a mounting bracket (350), and said mounting bracket (350) is secured said upstream extending portion (314, 414) through a hole (355, 455) formed in said first portion (306, 406). A discharge system (300, 301, 400) according to claim 17, characterized in that said hole (355, 455) includes an inner edge (356), said inner edge (356) annularly surrounding said support mounting bracket (350) is bent inwardly to abut an outer periphery of said sleeve (312, 412). 19. Discharge system (400) for a motor vehicle (100), said discharge system (400) being connected to a power unit (125) of said motor vehicle (100), the discharge system (400) being characterized in that it comprises: a discharge pipe (405), said discharge pipe (405) being formed by a first portion (406) and a second portion (407), said first portion (406) is connected to an exhaust port (184) of said power unit (125) through a first upstream end portion (408) thereof, said second portion (407) disposed downstream of said first portion (406) , wherein one of said first portion (406) and said second portion (407) is adapted to support a treatment device (411), said first portion (406) capable of annularly enclosing, at least partially, said treatment device (411), and said first portion (406) include a first downstream end portion secured to said second a portion (407), and wherein at least one resistance member (465, 466) is mounted to said treatment device (411). A flushing system (400) according to claim 19, characterized in that said at least one resistance member includes one or more first resistance members(s) (465) mounted to a sleeve (412) in a portion a upstream of a substrate (413) supported by said treatment device (411), and said first strength member (465) includes a plurality of perforations. A flushing system (400) as claimed in claim 19, characterized in that said at least one resistance member includes one or more second resistance members(s) (466) mounted to a sleeve (412) in an adjoining portion. downstream of a substrate (413) supported by said treatment device (411), and said second strength member (466) includes a plurality of perforations. Discharge system (400) according to claim 19, characterized in that said treatment device (411) is provided with a stop plate (480) provided at the downstream end thereof, and said second resistance member (s) (466) be provided with a plurality of perforations formed radially in said sleeve (412). A discharge system (200) as claimed in claim 19, characterized in that said at least one resistance member (465, 466) includes perforations having a total area in the range of 50 to 150% of an area of an area. front of said treatment device (411).